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Related Concept Videos

Eukaryotic Evolution01:24

Eukaryotic Evolution

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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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Eukaryotic Compartmentalization01:37

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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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Eukaryotic Compartmentalizations01:46

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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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Nuclear Protein Sorting01:34

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Enlargement of the Plasma Membrane01:22

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Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
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The Nucleus01:32

The Nucleus

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The nucleus is a membrane-bound organelle that acts as a control center in a eukaryotic cell. It contains chromosomal DNA, which controls gene expression and precisely regulates the production of proteins within the cell. In contrast, the DNA inside the mitochondria and chloroplast only carries out functions that are specific to those organelles.
Arrangement of DNA within Nucleus
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Related Experiment Video

Updated: Nov 21, 2025

A Cell Free Assay to Study Chromatin Decondensation at the End of Mitosis
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Evolution and diversification of the nuclear envelope.

Norma E Padilla-Mejia1, Alexandr A Makarov1, Lael D Barlow1

  • 1Division of Biological Chemistry and Drug Discovery, School of Life Sciences, University of Dundee , Dundee, UK.

Nucleus (Austin, Tex.)
|January 13, 2021
PubMed
Summary
This summary is machine-generated.

The eukaryotic nuclear envelope (NE), crucial for cell function, evolved from a common origin but shows significant lineage-specific adaptations. Conserved proteins handle core functions, while diverse proteins drive specialized roles in different cell types.

Keywords:
Nuclear envelopeeukaryogenesisevolutionheterochromatinlaminaproteome

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Proteomics

Background:

  • Eukaryotic cells evolved ~1.5 billion years ago, featuring an endomembrane system for intracellular compartments.
  • The nuclear envelope (NE) is a key component, characterized by a double lipid bilayer, nuclear pore complexes (NPCs), and endoplasmic reticulum (ER) continuity, suggesting a shared evolutionary origin.

Purpose of the Study:

  • To investigate the extent of specialization within the nuclear envelope (NE) across different lineages.
  • To determine which molecular evolution mechanisms contribute to the diversification of the NE.

Main Methods:

  • Comparative proteomic analysis of purified nuclear envelopes from various model systems.
  • Identification and functional enrichment analysis of conserved and lineage-specific proteins within the NE.

Main Results:

  • Widely conserved proteins are fewer in number but enriched in core nuclear functions.
  • Lineage-specific protein cohorts are more numerous and contribute significantly to specialized NE functions.
  • Proteomic data suggests significant diversification of NE functionality across evolutionary lineages.

Conclusions:

  • Despite a common evolutionary origin, the nuclear envelope (NE) has diversified considerably.
  • Lineage-specific proteins play a crucial role in the specialized functions of the NE in different organisms.
  • Understanding NE evolution requires considering both conserved core functions and lineage-specific adaptations.